Among the incidental operations are (a) the valuation of the bullion by weighing and assaying it; (b) " rating" the bullion, or calculating the amount of copper to be added to make up the standard alloy; (c) recovering the values from ground-up crucibles, ashes and floor sweepings (the Mint " sweep "); (d) assaying the melted bars; (e) " pyxing " the finished coin or selecting specimens to be weighed and assayed; (f) " telling " or counting the coin.
At intervals these coins are weighed and assayed by a jury of skilled persons and the results reported to the Crown.
This division of values brings us to the second point in his philosophy, his theory of what he called " vital series," by which he assayed to explain all life, action and thought.
Ores containing gold or silver are almost invariably assayed in the dry way; that is, by fusion with appropriate fluxes and ultimate separation of the elements in the metallic form.
The mass is then packed into boxes all of one size, and a specimen of each again assayed, the mean of the whole being taken as the average.
By mixing assayed samples he is able to produce an opium containing uniformly 10% of morphia.